add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/kernel/locking/locktorture.c
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..
@@ -1,23 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0+
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 /*
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  * Module-based torture test facility for locking
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  *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, you can access it online at
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- * http://www.gnu.org/licenses/gpl-2.0.html.
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- *
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  * Copyright (C) IBM Corporation, 2014
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  *
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- * Authors: Paul E. McKenney <paulmck@us.ibm.com>
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+ * Authors: Paul E. McKenney <paulmck@linux.ibm.com>
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  *          Davidlohr Bueso <dave@stgolabs.net>
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  *	Based on kernel/rcu/torture.c.
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  */
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@@ -44,7 +31,7 @@
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 #include <linux/torture.h>
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 MODULE_LICENSE("GPL");
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-MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
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+MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");
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35
 
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 torture_param(int, nwriters_stress, -1,
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 	     "Number of write-locking stress-test threads");
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@@ -449,8 +436,6 @@
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 static void torture_rtmutex_boost(struct torture_random_state *trsp)
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 {
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-	int policy;
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-	struct sched_param param;
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 	const unsigned int factor = 50000; /* yes, quite arbitrary */
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 	if (!rt_task(current)) {
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@@ -461,8 +446,7 @@
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 		 */
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 		if (trsp && !(torture_random(trsp) %
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 			      (cxt.nrealwriters_stress * factor))) {
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-			policy = SCHED_FIFO;
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-			param.sched_priority = MAX_RT_PRIO - 1;
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+			sched_set_fifo(current);
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 		} else /* common case, do nothing */
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 			return;
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 	} else {
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@@ -475,13 +459,10 @@
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 		 */
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 		if (!trsp || !(torture_random(trsp) %
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 			       (cxt.nrealwriters_stress * factor * 2))) {
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-			policy = SCHED_NORMAL;
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-			param.sched_priority = 0;
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+			sched_set_normal(current, 0);
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 		} else /* common case, do nothing */
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 			return;
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 	}
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-
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-	sched_setscheduler_nocheck(current, policy, &param);
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 }
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 static void torture_rtmutex_delay(struct torture_random_state *trsp)
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@@ -585,7 +566,7 @@
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 #include <linux/percpu-rwsem.h>
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 static struct percpu_rw_semaphore pcpu_rwsem;
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-void torture_percpu_rwsem_init(void)
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+static void torture_percpu_rwsem_init(void)
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 {
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 	BUG_ON(percpu_init_rwsem(&pcpu_rwsem));
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 }
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@@ -631,7 +612,7 @@
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 static int lock_torture_writer(void *arg)
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 {
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 	struct lock_stress_stats *lwsp = arg;
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-	static DEFINE_TORTURE_RANDOM(rand);
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+	DEFINE_TORTURE_RANDOM(rand);
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 	VERBOSE_TOROUT_STRING("lock_torture_writer task started");
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 	set_user_nice(current, MAX_NICE);
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@@ -644,13 +625,13 @@
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 		cxt.cur_ops->writelock();
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 		if (WARN_ON_ONCE(lock_is_write_held))
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 			lwsp->n_lock_fail++;
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-		lock_is_write_held = 1;
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+		lock_is_write_held = true;
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 		if (WARN_ON_ONCE(lock_is_read_held))
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 			lwsp->n_lock_fail++; /* rare, but... */
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 		lwsp->n_lock_acquired++;
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 		cxt.cur_ops->write_delay(&rand);
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-		lock_is_write_held = 0;
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+		lock_is_write_held = false;
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 		cxt.cur_ops->writeunlock();
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 		stutter_wait("lock_torture_writer");
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@@ -668,7 +649,7 @@
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 static int lock_torture_reader(void *arg)
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 {
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 	struct lock_stress_stats *lrsp = arg;
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-	static DEFINE_TORTURE_RANDOM(rand);
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+	DEFINE_TORTURE_RANDOM(rand);
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 	VERBOSE_TOROUT_STRING("lock_torture_reader task started");
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 	set_user_nice(current, MAX_NICE);
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@@ -678,13 +659,13 @@
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 			schedule_timeout_uninterruptible(1);
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 		cxt.cur_ops->readlock();
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-		lock_is_read_held = 1;
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+		lock_is_read_held = true;
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 		if (WARN_ON_ONCE(lock_is_write_held))
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 			lrsp->n_lock_fail++; /* rare, but... */
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 		lrsp->n_lock_acquired++;
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 		cxt.cur_ops->read_delay(&rand);
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-		lock_is_read_held = 0;
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+		lock_is_read_held = false;
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 		cxt.cur_ops->readunlock();
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 		stutter_wait("lock_torture_reader");
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@@ -699,7 +680,7 @@
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 static void __torture_print_stats(char *page,
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 				  struct lock_stress_stats *statp, bool write)
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 {
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-	bool fail = 0;
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+	bool fail = false;
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 	int i, n_stress;
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 	long max = 0, min = statp ? statp[0].n_lock_acquired : 0;
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 	long long sum = 0;
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@@ -717,7 +698,8 @@
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 	page += sprintf(page,
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 			"%s:  Total: %lld  Max/Min: %ld/%ld %s  Fail: %d %s\n",
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 			write ? "Writes" : "Reads ",
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-			sum, max, min, max / 2 > min ? "???" : "",
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+			sum, max, min,
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+			!onoff_interval && max / 2 > min ? "???" : "",
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 			fail, fail ? "!!!" : "");
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 	if (fail)
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 		atomic_inc(&cxt.n_lock_torture_errors);
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@@ -841,7 +823,9 @@
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 						"End of test: SUCCESS");
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 	kfree(cxt.lwsa);
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+	cxt.lwsa = NULL;
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 	kfree(cxt.lrsa);
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+	cxt.lrsa = NULL;
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 end:
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 	torture_cleanup_end();
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@@ -899,22 +883,22 @@
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 		cxt.nrealwriters_stress = 2 * num_online_cpus();
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 #ifdef CONFIG_DEBUG_MUTEXES
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-	if (strncmp(torture_type, "mutex", 5) == 0)
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+	if (str_has_prefix(torture_type, "mutex"))
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 		cxt.debug_lock = true;
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 #endif
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 #ifdef CONFIG_DEBUG_RT_MUTEXES
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-	if (strncmp(torture_type, "rtmutex", 7) == 0)
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+	if (str_has_prefix(torture_type, "rtmutex"))
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 		cxt.debug_lock = true;
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 #endif
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 #ifdef CONFIG_DEBUG_SPINLOCK
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-	if ((strncmp(torture_type, "spin", 4) == 0) ||
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-	    (strncmp(torture_type, "rw_lock", 7) == 0))
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+	if ((str_has_prefix(torture_type, "spin")) ||
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+	    (str_has_prefix(torture_type, "rw_lock")))
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 		cxt.debug_lock = true;
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 #endif
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 	/* Initialize the statistics so that each run gets its own numbers. */
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 	if (nwriters_stress) {
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-		lock_is_write_held = 0;
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+		lock_is_write_held = false;
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 		cxt.lwsa = kmalloc_array(cxt.nrealwriters_stress,
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 					 sizeof(*cxt.lwsa),
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 					 GFP_KERNEL);
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@@ -945,7 +929,7 @@
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 		}
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 		if (nreaders_stress) {
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-			lock_is_read_held = 0;
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+			lock_is_read_held = false;
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 			cxt.lrsa = kmalloc_array(cxt.nrealreaders_stress,
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 						 sizeof(*cxt.lrsa),
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 						 GFP_KERNEL);
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@@ -969,7 +953,7 @@
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 	/* Prepare torture context. */
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 	if (onoff_interval > 0) {
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 		firsterr = torture_onoff_init(onoff_holdoff * HZ,
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-					      onoff_interval * HZ);
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+					      onoff_interval * HZ, NULL);
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 		if (firsterr)
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 			goto unwind;
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 	}
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@@ -985,7 +969,7 @@
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 			goto unwind;
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 	}
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 	if (stutter > 0) {
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-		firsterr = torture_stutter_init(stutter);
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+		firsterr = torture_stutter_init(stutter, stutter);
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 		if (firsterr)
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 			goto unwind;
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 	}